ST TDA7296 User Manual
TDA7296
Fi
70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
1 FEATURES
■ MULTIPOWER BCD TECHNOLOGY
■ VERY HIGH OPERATING VOLTAGE RANGE
(±35V)
■ DMOS POWER STAGE
■ HIGH OUTPUT POWER (UP TO 60W MUSIC
POWER)
■ MUTING/STAND-BY FUNCTIONS
■ NO SWITCH ON/OFF NOISE
■ NO BOUCHEROT CELLS
■ VERY LOW DISTORTION
■ VERY LOW NOISE
■ SHORT CIRCUIT PROTECTION
■ THERMAL SHUTDOWN
2 DESCRIPTION
The TDA7296 is a monolithic integrated circuit in
Multiwatt15 package, intended for use as audio
class AB amplifier in Hi-Fi field applications (Home
Stereo, self powered loudspeakers, Topclass TV).
Figure 2. Typical Application and Test Circuit
gure 1. Package
Multiwatt15V
Multiwatt15H
(Short Leads)
Table 1. Order Codes
Part Number Package
TDA7296 Multiwatt15V
TDA7296HS Multiwatt15H (Short Leads)
Thanks to the wide voltage range and to the high
out current capability it is able to supply the highest power into both 4Ω and 8Ω loads even in presence of poor supply regulation, with high Supply
Voltage Rejection.
The built in muting function with turn on delay simplifies the remote operation avoiding switching onoff noises.
VM
VSTBY
February 2005
+VsC7 100nF C6 1000µF
R3 22K
C2
R2
22µF
680Ω
C1 470nF
R1 22K
R5 10K
R4 22K
C3 10µF C4 10µF
Note: The Boucherot cell R6, C10, normally not necessary for a stable operation it could
be needed in presence of particular load impedances at V
IN- 2
IN+
IN+MUTE
MUTE
STBY
3
4
10
MUTE
9
STBY
1
STBY-GND
713
-
+
THERMAL
SHUTDOWN
-Vs -PWVs
C9 100nF C8 1000µF
<±25V.
S
+PWVs+Vs
PROTECTION
158
-Vs
S/C
14
OUT
C5
22µF
6
BOOTSTRAP
D93AU011
R6
2.7Ω
C10
100nF
Rev. 10
1/15
TDA7296
Figure 3. Pin Connection
Table 2. Absolute Maximum Ratings
Symbol Parameter Value Unit
V
I
O
P
tot
T
op
T
stg
Supply Voltage (No Signal) ±35 V
S
Output Peak Current 5 A
Power Dissipation T
= 70°C 50 W
case
Operating Ambient Temperature Range 0 to 70 °C
, TjStorage and Junction Temperature 150 °C
Table 3. Thermal Data
Symbol Parameter Typ. Max Unit
R
th j-case
Thermal Resistance Junction-case 1 1.5 °C/W
Figure 4. Block Diagram
2/15
TDA7296
Table 4. Electrical Characteristcs (Refer to the Test Circuit VS = ±24V, RL = 8Ω, GV = 30dB; Rg = 50Ω;
= 25°C, f = 1 kHz; unless otherwise specified).
T
amb
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
V
I
P
SR Slew Rate 7 10 V/µs
G
G
f
L ,fH
SVR Supply Voltage Rejection f = 100Hz; V
STAND-BY FUNCTION (Ref: -Vs or GND)
V
ST on
V
ST off
AT T
I
q st-by
MUTE FUNCTION (Ref: -Vs ro GND)
V
V
AT T
Note (*):
MUSIC POWER is the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity)
1 sec after the application of a sinusoidal input signal of frequency 1KHz.
Supply Range ±10 ±35 V
S
I
Quiescent Current 20 30 65 mA
q
I
Input Bias Current 500 nA
b
Input Offset Voltage -10 10 mV
OS
Input Offset Current -100 100 nA
OS
RMS Continuous Output
O
Power
Music Power (RMS)
∆t = 1s (*)
d Total Harmonic Distortion (**) P
d = 05%
= ± 24V, RL = 8Ω;
V
S
V
= ± 21V, RL = 6Ω;
S
VS = ± 18V, RL = 4Ω;
d = 10%
= ± 29V, RL = 8Ω;
V
S
V
= ± 24V, RL = 6Ω;
S
V
= ± 22V, RL = 4Ω;
S
= 5W; f = 1kHz
O
27
27
27
30
30
30
60
60
60
0.005
PO = 0.1 to 20W; f = 20Hz to 20kHz
V
= ± 18V, RL = 4Ω;
S
PO = 5W; f = 1kHz
P
= 0.1 to 20W; f = 20Hz to 20kHz
O
Open Loop Voltage Gain 80 dB
V
Closed Loop Voltage Gain (1) 24 30 40 dB
V
e
Total Input Noise A = curve 1 µV
N
0.01
f = 20Hz to 20kHz 2 5 µV
frequency response (-3dB) PO =1W 20Hz to 20kHz
R
Input Resistance 100 kΩ
i
= 0.5Vrms 60 75 dB
ripple
T
Thermal Shutdown 145 °C
S
Stand-by on Threshold 1.5 V
Stand-by off Threshold 3.5 V
Stand-by Attenuation 70 90 dB
st-by
Quiescent Current @ Stand-by 1 3 mA
Mute on Threshold 1.5 V
Mon
Mute off Threshold 3.5 V
Moff
Mute AttenuatIon 60 80 dB
mute
0.1
0.1
W
W
W
W
W
W
%
%
%
Note (**): Tested with optimized Application Board (see fig.5)
3/15
TDA7296
Figure 5. P.C.B. and Components Layout of the Circuit of figure 2.
Note:
The Stand-by and Mute functions can be referred either to GND or -VS.
On the P.C.B. is possible to set both the configuration through the jumper J1.
4/15
TDA7296
3 APPLICATION SUGGESTIONS
(see Test and Application Circuits of the Fig. 2)
The recommended values of the external components are those shown on the application circuit of Figure
2. Different values can be used; the following table can help the designer.
COMPONENTS
R1 (*) 22k Input Resistance Increase Input
R2 680Ω Closed Loop Gain
R3 (*) 22k Increase of Gain Decrease of Gain
R4 22k St-by Time Constant Larger St-by
R5 10k Mute Time Constant Larger Mute
C1 0.47µF Input DC Decoupling Higher Low Frequency
C2 22µF Feedback DC
C3 10µF Mute Time Constant Larger Mute
C4 10µF St-by Time Constant Larger St-by
C5 22µF Bootstrapping Signal Degradation at
SUGGESTED
VALUE
PURPOSE
Set to 30db (**)
Decoupling
LARGER THAN
SUGGESTED
Impedance
Decrease of Gain Increase of Gain
ON/OFF Time
ON/OFF Time
ON/OFF Time
ON/OFF Time
SMALLER THAN
SUGGESTED
Decrease Input
Impedance
Smaller St-by ON/OFF
Time; Pop Noise
Smaller Mute
ON/OFF Time
Higher Low Frequency
Smaller Mute ON/OFF
Smaller St-by ON/OFF
Time; Pop Noise
Low Frequency
Cutoff
Cutoff
Time
C6, C8 1000µF Supply Voltage Bypass Danger of Oscillation
C7, C9 0.1µF Supply Voltage Bypass Danger of Oscillation
(*) R1 = R3 for pop optimization
(**) Closed Loop Gain has to be ≥ 24dB
5/15
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